1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __LINUX_GFP_H 3#define __LINUX_GFP_H 4 5#include <linux/mmdebug.h> 6#include <linux/mmzone.h> 7#include <linux/stddef.h> 8#include <linux/linkage.h> 9#include <linux/topology.h> 10 11struct vm_area_struct; 12 13/* 14 * In case of changes, please don't forget to update 15 * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c 16 */ 17 18/* Plain integer GFP bitmasks. Do not use this directly. */ 19#define ___GFP_DMA 0x01u 20#define ___GFP_HIGHMEM 0x02u 21#define ___GFP_DMA32 0x04u 22#define ___GFP_MOVABLE 0x08u 23#define ___GFP_RECLAIMABLE 0x10u 24#define ___GFP_HIGH 0x20u 25#define ___GFP_IO 0x40u 26#define ___GFP_FS 0x80u 27#define ___GFP_WRITE 0x100u 28#define ___GFP_NOWARN 0x200u 29#define ___GFP_RETRY_MAYFAIL 0x400u 30#define ___GFP_NOFAIL 0x800u 31#define ___GFP_NORETRY 0x1000u 32#define ___GFP_MEMALLOC 0x2000u 33#define ___GFP_COMP 0x4000u 34#define ___GFP_ZERO 0x8000u 35#define ___GFP_NOMEMALLOC 0x10000u 36#define ___GFP_HARDWALL 0x20000u 37#define ___GFP_THISNODE 0x40000u 38#define ___GFP_ATOMIC 0x80000u 39#define ___GFP_ACCOUNT 0x100000u 40#define ___GFP_DIRECT_RECLAIM 0x200000u 41#define ___GFP_KSWAPD_RECLAIM 0x400000u 42#ifdef CONFIG_LOCKDEP 43#define ___GFP_NOLOCKDEP 0x800000u 44#else 45#define ___GFP_NOLOCKDEP 0 46#endif 47/* If the above are modified, __GFP_BITS_SHIFT may need updating */ 48 49/* 50 * Physical address zone modifiers (see linux/mmzone.h - low four bits) 51 * 52 * Do not put any conditional on these. If necessary modify the definitions 53 * without the underscores and use them consistently. The definitions here may 54 * be used in bit comparisons. 55 */ 56#define __GFP_DMA ((__force gfp_t)___GFP_DMA) 57#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) 58#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) 59#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */ 60#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 61 62/** 63 * DOC: Page mobility and placement hints 64 * 65 * Page mobility and placement hints 66 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 67 * 68 * These flags provide hints about how mobile the page is. Pages with similar 69 * mobility are placed within the same pageblocks to minimise problems due 70 * to external fragmentation. 71 * 72 * %__GFP_MOVABLE (also a zone modifier) indicates that the page can be 73 * moved by page migration during memory compaction or can be reclaimed. 74 * 75 * %__GFP_RECLAIMABLE is used for slab allocations that specify 76 * SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers. 77 * 78 * %__GFP_WRITE indicates the caller intends to dirty the page. Where possible, 79 * these pages will be spread between local zones to avoid all the dirty 80 * pages being in one zone (fair zone allocation policy). 81 * 82 * %__GFP_HARDWALL enforces the cpuset memory allocation policy. 83 * 84 * %__GFP_THISNODE forces the allocation to be satisified from the requested 85 * node with no fallbacks or placement policy enforcements. 86 * 87 * %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg. 88 */ 89#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) 90#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) 91#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) 92#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE) 93#define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT) 94 95/** 96 * DOC: Watermark modifiers 97 * 98 * Watermark modifiers -- controls access to emergency reserves 99 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 100 * 101 * %__GFP_HIGH indicates that the caller is high-priority and that granting 102 * the request is necessary before the system can make forward progress. 103 * For example, creating an IO context to clean pages. 104 * 105 * %__GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is 106 * high priority. Users are typically interrupt handlers. This may be 107 * used in conjunction with %__GFP_HIGH 108 * 109 * %__GFP_MEMALLOC allows access to all memory. This should only be used when 110 * the caller guarantees the allocation will allow more memory to be freed 111 * very shortly e.g. process exiting or swapping. Users either should 112 * be the MM or co-ordinating closely with the VM (e.g. swap over NFS). 113 * 114 * %__GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves. 115 * This takes precedence over the %__GFP_MEMALLOC flag if both are set. 116 */ 117#define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC) 118#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) 119#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC) 120#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) 121 122/** 123 * DOC: Reclaim modifiers 124 * 125 * Reclaim modifiers 126 * ~~~~~~~~~~~~~~~~~ 127 * 128 * %__GFP_IO can start physical IO. 129 * 130 * %__GFP_FS can call down to the low-level FS. Clearing the flag avoids the 131 * allocator recursing into the filesystem which might already be holding 132 * locks. 133 * 134 * %__GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim. 135 * This flag can be cleared to avoid unnecessary delays when a fallback 136 * option is available. 137 * 138 * %__GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when 139 * the low watermark is reached and have it reclaim pages until the high 140 * watermark is reached. A caller may wish to clear this flag when fallback 141 * options are available and the reclaim is likely to disrupt the system. The 142 * canonical example is THP allocation where a fallback is cheap but 143 * reclaim/compaction may cause indirect stalls. 144 * 145 * %__GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim. 146 * 147 * The default allocator behavior depends on the request size. We have a concept 148 * of so called costly allocations (with order > %PAGE_ALLOC_COSTLY_ORDER). 149 * !costly allocations are too essential to fail so they are implicitly 150 * non-failing by default (with some exceptions like OOM victims might fail so 151 * the caller still has to check for failures) while costly requests try to be 152 * not disruptive and back off even without invoking the OOM killer. 153 * The following three modifiers might be used to override some of these 154 * implicit rules 155 * 156 * %__GFP_NORETRY: The VM implementation will try only very lightweight 157 * memory direct reclaim to get some memory under memory pressure (thus 158 * it can sleep). It will avoid disruptive actions like OOM killer. The 159 * caller must handle the failure which is quite likely to happen under 160 * heavy memory pressure. The flag is suitable when failure can easily be 161 * handled at small cost, such as reduced throughput 162 * 163 * %__GFP_RETRY_MAYFAIL: The VM implementation will retry memory reclaim 164 * procedures that have previously failed if there is some indication 165 * that progress has been made else where. It can wait for other 166 * tasks to attempt high level approaches to freeing memory such as 167 * compaction (which removes fragmentation) and page-out. 168 * There is still a definite limit to the number of retries, but it is 169 * a larger limit than with %__GFP_NORETRY. 170 * Allocations with this flag may fail, but only when there is 171 * genuinely little unused memory. While these allocations do not 172 * directly trigger the OOM killer, their failure indicates that 173 * the system is likely to need to use the OOM killer soon. The 174 * caller must handle failure, but can reasonably do so by failing 175 * a higher-level request, or completing it only in a much less 176 * efficient manner. 177 * If the allocation does fail, and the caller is in a position to 178 * free some non-essential memory, doing so could benefit the system 179 * as a whole. 180 * 181 * %__GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 182 * cannot handle allocation failures. The allocation could block 183 * indefinitely but will never return with failure. Testing for 184 * failure is pointless. 185 * New users should be evaluated carefully (and the flag should be 186 * used only when there is no reasonable failure policy) but it is 187 * definitely preferable to use the flag rather than opencode endless 188 * loop around allocator. 189 * Using this flag for costly allocations is _highly_ discouraged. 190 */ 191#define __GFP_IO ((__force gfp_t)___GFP_IO) 192#define __GFP_FS ((__force gfp_t)___GFP_FS) 193#define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */ 194#define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */ 195#define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM)) 196#define __GFP_RETRY_MAYFAIL ((__force gfp_t)___GFP_RETRY_MAYFAIL) 197#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) 198#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) 199 200/** 201 * DOC: Action modifiers 202 * 203 * Action modifiers 204 * ~~~~~~~~~~~~~~~~ 205 * 206 * %__GFP_NOWARN suppresses allocation failure reports. 207 * 208 * %__GFP_COMP address compound page metadata. 209 * 210 * %__GFP_ZERO returns a zeroed page on success. 211 */ 212#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) 213#define __GFP_COMP ((__force gfp_t)___GFP_COMP) 214#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) 215 216/* Disable lockdep for GFP context tracking */ 217#define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP) 218 219/* Room for N __GFP_FOO bits */ 220#define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP)) 221#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 222 223/** 224 * DOC: Useful GFP flag combinations 225 * 226 * Useful GFP flag combinations 227 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 228 * 229 * Useful GFP flag combinations that are commonly used. It is recommended 230 * that subsystems start with one of these combinations and then set/clear 231 * %__GFP_FOO flags as necessary. 232 * 233 * %GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower 234 * watermark is applied to allow access to "atomic reserves" 235 * 236 * %GFP_KERNEL is typical for kernel-internal allocations. The caller requires 237 * %ZONE_NORMAL or a lower zone for direct access but can direct reclaim. 238 * 239 * %GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is 240 * accounted to kmemcg. 241 * 242 * %GFP_NOWAIT is for kernel allocations that should not stall for direct 243 * reclaim, start physical IO or use any filesystem callback. 244 * 245 * %GFP_NOIO will use direct reclaim to discard clean pages or slab pages 246 * that do not require the starting of any physical IO. 247 * Please try to avoid using this flag directly and instead use 248 * memalloc_noio_{save,restore} to mark the whole scope which cannot 249 * perform any IO with a short explanation why. All allocation requests 250 * will inherit GFP_NOIO implicitly. 251 * 252 * %GFP_NOFS will use direct reclaim but will not use any filesystem interfaces. 253 * Please try to avoid using this flag directly and instead use 254 * memalloc_nofs_{save,restore} to mark the whole scope which cannot/shouldn't 255 * recurse into the FS layer with a short explanation why. All allocation 256 * requests will inherit GFP_NOFS implicitly. 257 * 258 * %GFP_USER is for userspace allocations that also need to be directly 259 * accessibly by the kernel or hardware. It is typically used by hardware 260 * for buffers that are mapped to userspace (e.g. graphics) that hardware 261 * still must DMA to. cpuset limits are enforced for these allocations. 262 * 263 * %GFP_DMA exists for historical reasons and should be avoided where possible. 264 * The flags indicates that the caller requires that the lowest zone be 265 * used (%ZONE_DMA or 16M on x86-64). Ideally, this would be removed but 266 * it would require careful auditing as some users really require it and 267 * others use the flag to avoid lowmem reserves in %ZONE_DMA and treat the 268 * lowest zone as a type of emergency reserve. 269 * 270 * %GFP_DMA32 is similar to %GFP_DMA except that the caller requires a 32-bit 271 * address. 272 * 273 * %GFP_HIGHUSER is for userspace allocations that may be mapped to userspace, 274 * do not need to be directly accessible by the kernel but that cannot 275 * move once in use. An example may be a hardware allocation that maps 276 * data directly into userspace but has no addressing limitations. 277 * 278 * %GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not 279 * need direct access to but can use kmap() when access is required. They 280 * are expected to be movable via page reclaim or page migration. Typically, 281 * pages on the LRU would also be allocated with %GFP_HIGHUSER_MOVABLE. 282 * 283 * %GFP_TRANSHUGE and %GFP_TRANSHUGE_LIGHT are used for THP allocations. They 284 * are compound allocations that will generally fail quickly if memory is not 285 * available and will not wake kswapd/kcompactd on failure. The _LIGHT 286 * version does not attempt reclaim/compaction at all and is by default used 287 * in page fault path, while the non-light is used by khugepaged. 288 */ 289#define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM) 290#define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS) 291#define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT) 292#define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM) 293#define GFP_NOIO (__GFP_RECLAIM) 294#define GFP_NOFS (__GFP_RECLAIM | __GFP_IO) 295#define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 296#define GFP_DMA __GFP_DMA 297#define GFP_DMA32 __GFP_DMA32 298#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) 299#define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) 300#define GFP_TRANSHUGE_LIGHT ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ 301 __GFP_NOMEMALLOC | __GFP_NOWARN) & ~__GFP_RECLAIM) 302#define GFP_TRANSHUGE (GFP_TRANSHUGE_LIGHT | __GFP_DIRECT_RECLAIM) 303 304/* Convert GFP flags to their corresponding migrate type */ 305#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 306#define GFP_MOVABLE_SHIFT 3 307 308static inline int gfpflags_to_migratetype(const gfp_t gfp_flags) 309{ 310 VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 311 BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE); 312 BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE); 313 314 if (unlikely(page_group_by_mobility_disabled)) 315 return MIGRATE_UNMOVABLE; 316 317 /* Group based on mobility */ 318 return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; 319} 320#undef GFP_MOVABLE_MASK 321#undef GFP_MOVABLE_SHIFT 322 323static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) 324{ 325 return !!(gfp_flags & __GFP_DIRECT_RECLAIM); 326} 327 328#ifdef CONFIG_HIGHMEM 329#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 330#else 331#define OPT_ZONE_HIGHMEM ZONE_NORMAL 332#endif 333 334#ifdef CONFIG_ZONE_DMA 335#define OPT_ZONE_DMA ZONE_DMA 336#else 337#define OPT_ZONE_DMA ZONE_NORMAL 338#endif 339 340#ifdef CONFIG_ZONE_DMA32 341#define OPT_ZONE_DMA32 ZONE_DMA32 342#else 343#define OPT_ZONE_DMA32 ZONE_NORMAL 344#endif 345 346/* 347 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 348 * zone to use given the lowest 4 bits of gfp_t. Entries are GFP_ZONES_SHIFT 349 * bits long and there are 16 of them to cover all possible combinations of 350 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 351 * 352 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 353 * But GFP_MOVABLE is not only a zone specifier but also an allocation 354 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 355 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 356 * 357 * bit result 358 * ================= 359 * 0x0 => NORMAL 360 * 0x1 => DMA or NORMAL 361 * 0x2 => HIGHMEM or NORMAL 362 * 0x3 => BAD (DMA+HIGHMEM) 363 * 0x4 => DMA32 or NORMAL 364 * 0x5 => BAD (DMA+DMA32) 365 * 0x6 => BAD (HIGHMEM+DMA32) 366 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 367 * 0x8 => NORMAL (MOVABLE+0) 368 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 369 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 370 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 371 * 0xc => DMA32 or NORMAL (MOVABLE+DMA32) 372 * 0xd => BAD (MOVABLE+DMA32+DMA) 373 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 374 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 375 * 376 * GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms. 377 */ 378 379#if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4 380/* ZONE_DEVICE is not a valid GFP zone specifier */ 381#define GFP_ZONES_SHIFT 2 382#else 383#define GFP_ZONES_SHIFT ZONES_SHIFT 384#endif 385 386#if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG 387#error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 388#endif 389 390#define GFP_ZONE_TABLE ( \ 391 (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ 392 | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ 393 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ 394 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ 395 | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ 396 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ 397 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ 398 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\ 399) 400 401/* 402 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 403 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 404 * entry starting with bit 0. Bit is set if the combination is not 405 * allowed. 406 */ 407#define GFP_ZONE_BAD ( \ 408 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 409 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 410 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 411 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 412 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 413 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 414 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 415 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 416) 417 418static inline enum zone_type gfp_zone(gfp_t flags) 419{ 420 enum zone_type z; 421 int bit = (__force int) (flags & GFP_ZONEMASK); 422 423 z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) & 424 ((1 << GFP_ZONES_SHIFT) - 1); 425 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 426 return z; 427} 428 429/* 430 * There is only one page-allocator function, and two main namespaces to 431 * it. The alloc_page*() variants return 'struct page *' and as such 432 * can allocate highmem pages, the *get*page*() variants return 433 * virtual kernel addresses to the allocated page(s). 434 */ 435 436static inline int gfp_zonelist(gfp_t flags) 437{ 438#ifdef CONFIG_NUMA 439 if (unlikely(flags & __GFP_THISNODE)) 440 return ZONELIST_NOFALLBACK; 441#endif 442 return ZONELIST_FALLBACK; 443} 444 445/* 446 * We get the zone list from the current node and the gfp_mask. 447 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 448 * There are two zonelists per node, one for all zones with memory and 449 * one containing just zones from the node the zonelist belongs to. 450 * 451 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 452 * optimized to &contig_page_data at compile-time. 453 */ 454static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 455{ 456 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 457} 458 459#ifndef HAVE_ARCH_FREE_PAGE 460static inline void arch_free_page(struct page *page, int order) { } 461#endif 462#ifndef HAVE_ARCH_ALLOC_PAGE 463static inline void arch_alloc_page(struct page *page, int order) { } 464#endif 465 466struct page * 467__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, 468 nodemask_t *nodemask); 469 470static inline struct page * 471__alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid) 472{ 473 return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL); 474} 475 476/* 477 * Allocate pages, preferring the node given as nid. The node must be valid and 478 * online. For more general interface, see alloc_pages_node(). 479 */ 480static inline struct page * 481__alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) 482{ 483 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); 484 VM_WARN_ON((gfp_mask & __GFP_THISNODE) && !node_online(nid)); 485 486 return __alloc_pages(gfp_mask, order, nid); 487} 488 489/* 490 * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE, 491 * prefer the current CPU's closest node. Otherwise node must be valid and 492 * online. 493 */ 494static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 495 unsigned int order) 496{ 497 if (nid == NUMA_NO_NODE) 498 nid = numa_mem_id(); 499 500 return __alloc_pages_node(nid, gfp_mask, order); 501} 502 503#ifdef CONFIG_NUMA 504extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 505 506static inline struct page * 507alloc_pages(gfp_t gfp_mask, unsigned int order) 508{ 509 return alloc_pages_current(gfp_mask, order); 510} 511extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 512 struct vm_area_struct *vma, unsigned long addr, 513 int node, bool hugepage); 514#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 515 alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true) 516#else 517#define alloc_pages(gfp_mask, order) \ 518 alloc_pages_node(numa_node_id(), gfp_mask, order) 519#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\ 520 alloc_pages(gfp_mask, order) 521#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 522 alloc_pages(gfp_mask, order) 523#endif 524#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 525#define alloc_page_vma(gfp_mask, vma, addr) \ 526 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false) 527#define alloc_page_vma_node(gfp_mask, vma, addr, node) \ 528 alloc_pages_vma(gfp_mask, 0, vma, addr, node, false) 529 530extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 531extern unsigned long get_zeroed_page(gfp_t gfp_mask); 532 533void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 534void free_pages_exact(void *virt, size_t size); 535void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); 536 537#define __get_free_page(gfp_mask) \ 538 __get_free_pages((gfp_mask), 0) 539 540#define __get_dma_pages(gfp_mask, order) \ 541 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 542 543extern void __free_pages(struct page *page, unsigned int order); 544extern void free_pages(unsigned long addr, unsigned int order); 545extern void free_unref_page(struct page *page); 546extern void free_unref_page_list(struct list_head *list); 547 548struct page_frag_cache; 549extern void __page_frag_cache_drain(struct page *page, unsigned int count); 550extern void *page_frag_alloc(struct page_frag_cache *nc, 551 unsigned int fragsz, gfp_t gfp_mask); 552extern void page_frag_free(void *addr); 553 554#define __free_page(page) __free_pages((page), 0) 555#define free_page(addr) free_pages((addr), 0) 556 557void page_alloc_init(void); 558void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 559void drain_all_pages(struct zone *zone); 560void drain_local_pages(struct zone *zone); 561 562void page_alloc_init_late(void); 563 564/* 565 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what 566 * GFP flags are used before interrupts are enabled. Once interrupts are 567 * enabled, it is set to __GFP_BITS_MASK while the system is running. During 568 * hibernation, it is used by PM to avoid I/O during memory allocation while 569 * devices are suspended. 570 */ 571extern gfp_t gfp_allowed_mask; 572 573/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ 574bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); 575 576extern void pm_restrict_gfp_mask(void); 577extern void pm_restore_gfp_mask(void); 578 579#ifdef CONFIG_PM_SLEEP 580extern bool pm_suspended_storage(void); 581#else 582static inline bool pm_suspended_storage(void) 583{ 584 return false; 585} 586#endif /* CONFIG_PM_SLEEP */ 587 588#if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) 589/* The below functions must be run on a range from a single zone. */ 590extern int alloc_contig_range(unsigned long start, unsigned long end, 591 unsigned migratetype, gfp_t gfp_mask); 592extern void free_contig_range(unsigned long pfn, unsigned nr_pages); 593#endif 594 595#ifdef CONFIG_CMA 596/* CMA stuff */ 597extern void init_cma_reserved_pageblock(struct page *page); 598#endif 599 600#endif /* __LINUX_GFP_H */ 601